Adjustable stand base



FIG. 1 is a perspective view of an adjustable stand base, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view showing the stand base in folded out condition;

FIG. 8 is a front elevational view thereof;

FIG. 9 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 10 is a rear elevational view thereof;

FIG. 11 is a top plan view thereof; and,

FIG. 12 is a bottom plan view thereof. 

The ornamental design for a adjustable stand base, as shown and described. 